/// <summary>
/// Initializes a new instance of the DbaseFileWriter class.
/// </summary>
/// <param name="filename">The filename of the file create/ append.</param>
/// <param name="append">True to append to a file. False to create a new file.</param>
public DbaseFileWriter(string filename, bool append)
{
if (filename == null)
{
throw new ArgumentNullException("filename");
}
_filename = filename;
if (append == false)
{
_writer = new BinaryWriter(File.Open(filename, FileMode.Create, FileAccess.Write, FileShare.None));
_header = new DbaseFileHeader();
}
else
{
using (BinaryReader reader = new BinaryReader(File.Open(filename, FileMode.Open)))
{
_header = new DbaseFileHeader();
_header.ReadHeader(reader);
reader.Close();
}
_recordCount = _header.NumRecords;
_writer = new BinaryWriter(File.Open(filename, FileMode.Open, FileAccess.ReadWrite));
_writer.BaseStream.Position = _writer.BaseStream.Length;
_headerWritten = true;
}
}
protected void ReadHeader()
{
_header = new DbaseFileHeader();
// read the header
_header.ReadHeader(_dbfStream);
// how many records remain
_readPosition = _header.HeaderLength;
}
/// <summary>
/// Gets the header information for the dbase file.
/// </summary>
/// <returns>DbaseFileHeader contain header and field information.</returns>
public DbaseFileHeader GetHeader()
{
if (_header == null)
{
using (BinaryReader dbfStream = new BinaryReader(File.OpenRead(_filename)))
{
_header = new DbaseFileHeader();
_header.ReadHeader(dbfStream);
}
}
return(_header);
}
/// <summary>
/// Gets the header information for the dbase file.
/// </summary>
/// <returns>DbaseFileHeader contain header and field information.</returns>
public DbaseFileHeader GetHeader()
{
if (_header == null)
{
FileStream stream = new FileStream(_filename, System.IO.FileMode.Open);
BinaryReader dbfStream = new BinaryReader(stream);
_header = new DbaseFileHeader();
// read the header
_header.ReadHeader(dbfStream);
dbfStream.Close();
stream.Close();
}
return(_header);
}
private void Initialize()
{
// Cache the .dbf header
_dbfHeader = new DbaseFileHeader();
using (BinaryReader dbfReader = new BinaryReader(File.OpenRead(Path.Combine(Path.GetDirectoryName(_path), Path.GetFileNameWithoutExtension(_path) + ".dbf"))))
{
_dbfHeader.ReadHeader(dbfReader);
_dbfHeaderOffset = dbfReader.BaseStream.Position;
}
// Need to make one pass over the geometries and pull out the bounding boxes
_spatialIndex = new com.vividsolutions.jts.index.strtree.STRtree();
_extents = new Envelope();
using (BigEndianBinaryReader shpReader = new BigEndianBinaryReader(File.OpenRead(_path)))
using (ShapefileIndexReader shxReader = new ShapefileIndexReader(Path.Combine(Path.GetDirectoryName(_path), Path.GetFileNameWithoutExtension(_path) + ".shx")))
{
// Get the shape type
_type = new ShapefileHeader(shpReader).ShapeType;
while (shxReader.Read())
{
int offset = shxReader.GetOffest();
int length = shxReader.GetLength();
// Move to the start of geometry
shpReader.BaseStream.Position = offset * 2;
double xMin;
double yMin;
double xMax;
double yMax;
int recordNumber = shpReader.ReadIntBE();
int contentLength = shpReader.ReadIntBE();
// Read shape type
int type = shpReader.ReadInt32();
if (type != 1)
{
xMin = shpReader.ReadDouble();
yMin = shpReader.ReadDouble();
xMax = shpReader.ReadDouble();
yMax = shpReader.ReadDouble();
}
else
{
// Point - read x and y
xMin = shpReader.ReadDouble();
yMin = shpReader.ReadDouble();
xMax = yMin;
yMax = yMin;
}
// Build the envelope
Envelope extents = new Envelope(xMin, xMax, yMin, yMax);
// Add to total extents
_extents.expandToInclude(extents);
// Insert the index of the record into the spatial index
_spatialIndex.insert(extents, new ShapefileRecordPointer(recordNumber, offset * 2, contentLength, (int)_dbfHeaderOffset + (_dbfHeader.RecordLength * (recordNumber - 1))));
}
// Build the index once
_spatialIndex.build();
}
}
/// <summary>
/// Initializes a new instance of the DbaseFileWriter class.
/// </summary>
/// <param name="filename">The filename of the file create/ append.</param>
/// <param name="append">True to append to a file. False to create a new file.</param>
public DbaseFileWriter(string filename,bool append)
{
if (filename == null)
{
throw new ArgumentNullException("filename");
}
_filename = filename;
if (append == false)
{
_writer = new BinaryWriter(File.Open(filename, FileMode.Create, FileAccess.Write, FileShare.None));
_header = new DbaseFileHeader();
}
else
{
using (BinaryReader reader = new BinaryReader(File.Open(filename, FileMode.Open)))
{
_header = new DbaseFileHeader();
_header.ReadHeader(reader);
reader.Close();
}
_recordCount = _header.NumRecords;
_writer = new BinaryWriter(File.Open(filename, FileMode.Open, FileAccess.ReadWrite));
_writer.BaseStream.Position = _writer.BaseStream.Length;
_headerWritten = true;
}
}
protected void ReadHeader()
{
_header = new DbaseFileHeader();
// read the header
_header.ReadHeader(_dbfStream);
// how many records remain
_readPosition = _header.HeaderLength;
}
/// <summary>
/// Gets the header information for the dbase file.
/// </summary>
/// <returns>DbaseFileHeader contain header and field information.</returns>
public DbaseFileHeader GetHeader()
{
if (_header == null)
{
using (BinaryReader dbfStream = new BinaryReader(File.OpenRead(_filename)))
{
_header = new DbaseFileHeader();
_header.ReadHeader(dbfStream);
}
}
return _header;
}
private void Initialize()
{
// Cache the .dbf header
_dbfHeader = new DbaseFileHeader();
using (BinaryReader dbfReader = new BinaryReader(File.OpenRead(Path.Combine(Path.GetDirectoryName(_path), Path.GetFileNameWithoutExtension(_path) + ".dbf"))))
{
_dbfHeader.ReadHeader(dbfReader);
_dbfHeaderOffset = dbfReader.BaseStream.Position;
}
// Need to make one pass over the geometries and pull out the bounding boxes
_spatialIndex = new com.vividsolutions.jts.index.strtree.STRtree();
_extents = new Envelope();
using (BigEndianBinaryReader shpReader = new BigEndianBinaryReader(File.OpenRead(_path)))
using (ShapefileIndexReader shxReader = new ShapefileIndexReader(Path.Combine(Path.GetDirectoryName(_path), Path.GetFileNameWithoutExtension(_path) + ".shx")))
{
// Get the shape type
_type = new ShapefileHeader(shpReader).ShapeType;
while (shxReader.Read())
{
int offset = shxReader.GetOffest();
int length = shxReader.GetLength();
// Move to the start of geometry
shpReader.BaseStream.Position = offset * 2;
double xMin;
double yMin;
double xMax;
double yMax;
int recordNumber = shpReader.ReadIntBE();
int contentLength = shpReader.ReadIntBE();
// Read shape type
int type = shpReader.ReadInt32();
if (type != 1)
{
xMin = shpReader.ReadDouble();
yMin = shpReader.ReadDouble();
xMax = shpReader.ReadDouble();
yMax = shpReader.ReadDouble();
}
else
{
// Point - read x and y
xMin = shpReader.ReadDouble();
yMin = shpReader.ReadDouble();
xMax = yMin;
yMax = yMin;
}
// Build the envelope
Envelope extents = new Envelope(xMin, xMax, yMin, yMax);
// Add to total extents
_extents.expandToInclude(extents);
// Insert the index of the record into the spatial index
_spatialIndex.insert(extents, new ShapefileRecordPointer(recordNumber, offset * 2, contentLength, (int)_dbfHeaderOffset + (_dbfHeader.RecordLength * (recordNumber - 1))));
}
// Build the index once
_spatialIndex.build();
}
}
